IBM NetVista X40, Техническое руководство

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Chapter 2. System board features
7
because, although it has a fixed IRQ line, the mouse relies on the addresses of the
keyboard for operation. For the keyboard and mouse interfaces, no resource
assignments are given in the system memory addresses or DMA channels. For
information on the resource assignments, see “Input/output address map” on page
34 and “Appendix C. IRQ and DMA channel assignments,” on page 39.
The system board has PS/2 type connectors for a keyboard and mouse. For
information on the connector pin assignments, see “Mouse and keyboard port
connectors” on page 32.
Network connection
Your computer is equipped with an Ethernet controller that supports the Wake on
LAN feature.
Features of the optional Wake on LAN Ethernet adapter are:
• Operates in shared 10BASE-T or 100BASE-TX environment
• Transmits and receives data at 10 Mbps or 100 Mbps
• Has an RJ-45 connector for LAN attachment
• Operates on symmetrical multiprocessing (SMP) environments
• Supports Wake on LAN
The computer has a 3-pin header on the system board that provides the AUX5
(auxiliary 5 volts) and wake-up signal connections.
Real-time clock and CMOS
The real-time clock is low-power and provides a time-of-day clock and a calendar. An
external battery source of 3 V dc maintains the settings.
The system uses 242 bytes of complementary metal-oxide semiconductor (CMOS)
memory to store data. To erase or reset CMOS memory to the default, use the small
rocker switch on the system board.
Note: Refer to the instructions in the Hardware Maintenance Manual before
attempting to reset CMOS.
To locate the battery see “System board” on page 8.
Flash EEPROM
The system board uses two megabits (Mb) of flash electrically erasable
programmable, read-only memory (EEPROM) to store the basic input/output system
(BIOS), IBM logo, Configuration/Setup Utility, and Plug and Play data.
If necessary, you can update the EEPROM by downloading a stand-alone utility
program available from the IBM Web site: http://www.ibm.com/pc.
Expansion adapters
Each PCI-expansion connector is a 32-bit slot. PCI-expansion connectors support the
32-bit, 5 V dc, local-bus signalling environment defined in PCI Local Bus Specification
2.2.
Your computer has two PCI slots to support the addition of adapters. For information
on installing adapters, see the User Guide.
For information on the connector pin assignments, see “PCI connectors” on page 26.